Improvement in boilers



Le ROY S, WHITE.

Boiler.

Patented Dec.;23,1879.

Ill; 12 hr N.FETER5, PHOTO-UTHOGRAFHER, WASHINGTON. n c.

UNITED STATES PATENT OFFICE.

LE ROY S. WHITE, OF WATERBURY, CONNECTICUT, ASSIGNOR TO BROWN & BROTHERS, OF SAME PLACE.

IMPROVEMENT IN BOILERS.

Specification forming part of Letters Patent No. 222,971, dated December 23, 1879; application filed May 28, 1879.

To all whom it may concern.-

Be it known that I, LE ROY S. WHITE, of Waterbury, in the county of New Haven and State of Connecticut, have invented a new and. useful Improvement in Boilers,of which the following is a description, reference being had to the accompanying drawings, forming part of this specification.

This invention is more particularly designed to be applied to kitchen-boilers, which are more or less liable to collapse by reason of superior pressure on their outside, consequent on the formation of a vacuum within them.

The invention consists in a boiler having a spiral brace of corrugated metal secured to the interior surface of its body or outer shell, whereby increased strength is given to the boiler against collapse without materially adding to the weight of metal used, said spiral brace forming a continuous interior support to the actual body or outer shell of the boiler.

Figure l of the accompanying drawings is a longitudinal sectional view of a kitchenboiler having this invention applied; and Fig. 2 a longitudinal view, inpart, of the spiral brace shown in Fig. 1 as applied internally to the body or outer shell of the boiler.

A is the body or outer shell of a kitchenboiler, which may be made in the ordinary or any suitable way, but which, as here shown, is supposed to be made of copper or other suitable ductile metal, without any longitudinal seam or joint, and in which the body or outer shell and one of its heads are formed by drawing or spinning.

B is a spiral brace arranged to re-enforce or stiffen internally the body or outer shell, A, of the boiler throughout its length, or thereabout. Said spiral brace is formed of a strip of hard-rolled or drawn metal, corrugated throughout its length to increase its strength, and wound spirally around a roll or mandrel to give to it its necessary shape and diameter.

This spiral brace, which is more or less elastic, is then slipped or forced into the body or outer shell, A, or made to spring with the lat; ter to hold itself tight, and may be secured therein by solderin gas, for instance, when the boiler is tinned inside,- and whereby the tinnin g of the boiler also serves to secure or solder the spiral brace to the interior of the boiler; and said brace, which must be made of metal that will not melt at the temperature which would melt the solder, serves to conduct the fluid tin along the boiler as the latter is rotated for that purpose.

By constructing the spiral brace of corrugated metal, as shown in the drawings, increased stren gth is given to it for a given weight of metal, and the body or outer shell of the boiler may accordingly be made of lighter metal to sustain a given external pressure than it otherwise could be.

I claim- A boiler having a spiral brace of corrugated metal secured to the interior surface of its body or outer shell, essentially as shown and described.

LE ROY S. WHITE. Witnesses:

FRANK PARTREE, THERON MINOR. 

